NPI registry status
Active
2026 NPPES data Surgical Physician Assistant NPI 1114078631 PA-C
Verify on CMS → Mark Okawachi, PA-C
Surgical Physician Assistant in Walnut Creek, California.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 16,380 in Surgical Physician Assistant, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
564
Medicare Part D claims · 205 beneficiaries · Surgical Physician Assistant avg: 341
Generic prescribing
96%
generic claims · 4% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Mark Okawachi, PA-C filed 564 Medicare Part D claims in 2024 as a Surgical Physician Assistant in Walnut Creek, California, prescribing 96% generic.
- 564
- Part D claims, 2024
- 96%
- generic prescribing
- ≥65th
- pct by Part D claim volume (lower-bound band)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Federal trust snapshot
What official records show about Mark Okawachi, PA-C
Bare NPI registry listing — limited federal enrichment beyond basic enumeration. Verify all credentials with official sources.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1114078631), first enumerated 01/12/2007.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 564 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- State context
State board disciplinary context
California statewide board action statistics are published annually — these figures describe aggregate state activity, not Mark Okawachi, PA-C's individual license status. Verify directly with the state medical board.
Source: MBC annual report 2023
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1114078631 · Surgical Physician Assistant
NPI-10 · ENUM-MID · TAX-MID · RX-LIGHT · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1114078631
- ENUM-MID 2007
- TAX-MID 16K Surgical Physician
- RX-LIGHT 564
- BOOK-LIGHT 992 in California
- PHOTO-ENUM Darrel Sides, CSA · 2007
Mark Okawachi, PA-C's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
564 ≥ 65th percentile 65% of 1,416,883 prescribers are in lower value bands
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2024
What does the federal data show about Mark Okawachi, PA-C?
Quality data not reportedPrimary specialty
Surgical Physician Assistant
Medicare Part D claims
564 65% vs specialty avg
Specialty distribution in California
How Surgical Physician Assistant compares to other specialties among California providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Surgical Physician Assistant. Verify directly:
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Practice Address
Provider Details
| NPI | 1114078631 |
|---|---|
| Specialty | Surgical Physician Assistant |
| Credentials | PA-C |
| Gender | Male |
| NPI Issued | 01/12/2007 |
License & disciplinary context - California MBC 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~150K California medical licensees in 2023 - they are NOT specific to Mark Okawachi, PA-C. To verify Mark Okawachi, PA-C's current license status, search the MBC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
576
Total board actions, California 2023
Across 556 cases
3.84
Actions per 1,000 licensees
California statewide rate
probation
Most common action type
186 cases
MBC publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the California disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Generic-heavy
Mark Okawachi, PA-C - brand share 4.0%
Surgical Physician Assistant average
4% brand-name claims vs 96% generic, on 564 2024 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2024.
564
Total Claims
$7K
Total Drug Cost
205
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 581.267
- Total Day Supply
- 7,414
- Brand vs Generic
- 4% brand / 96% generic
- Brand Drug Cost
- $2K
- Generic Drug Cost
- $5K
- Opioid Claims
- 221 (39.2% rate)
- Antibiotic Claims
- 25
Patient Demographics
- Average Patient Age
- 75.6 years
- Avg HCC Risk Score
- 0.87
- Gender Split
- 56% female / 44% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Mark Okawachi, PA-C prescribes most
Top Medicare Part D drugs by claim count, 2024
- Oxycodone Hcl
Oxycodone Hcl
193 claims
- Ondansetron Odt
Ondansetron Odt
133 claims
- Omeprazole
Omeprazole
92 claims
- Gabapentin 31
Gabapentin
31 claims
- Enoxaparin Sodium 28
Enoxaparin Sodium
28 claims
- Hydrocodone-Acetam… 20
Hydrocodone-Acetaminophen
20 claims
- Meloxicam 17
Meloxicam
17 claims
- Cefadroxil 13
Cefadroxil
13 claims
| Drug | Claims |
|---|---|
| Oxycodone Hcl | 193 |
| Ondansetron Odt Ondansetron | 133 |
| Omeprazole | 92 |
| Gabapentin | 31 |
| Enoxaparin Sodium | 28 |
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 20 |
| Meloxicam | 17 |
| Cefadroxil | 13 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Surgical Physician Assistant Overview
How Mark Okawachi, PA-C fits within the Surgical Physician Assistant landscape nationally.
16,380
Surgical Physician Assistant Providers in US
54
States with Surgical Physician Assistant
341
Avg Claims per Provider
Mark Okawachi, PA-C's 564 claims are above the specialty average of 341.
Nationwide Surgical Physician Assistant peers with similar MIPS or enrollment year
Two federal-record peer sets for Okawachi, both outside California so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2007)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Surgical Physician Assistant Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Okawachi.
One of 992 Surgical Physician Assistant providers enrolled in California, 5 are shown here.
Terri Abbott
P.A.
La Jolla, CA
Jory Adam
PA-C
Greenbrae, CA
Zulhumar Adil
PA-C
Fullerton, CA
Neil Adler
PA
San Jose, CA
Jennifer Afari
PA-C
Beverly Hills, CA
Compare Surgical Physician Assistant nationally: see state-by-state distribution →
Frequently Asked Questions
What is Mark Okawachi, PA-C's specialty? ▼
Mark Okawachi, PA-C specializes in Surgical Physician Assistant and practices in Walnut Creek, California. Credentials: PA-C.
How much does Mark Okawachi, PA-C prescribe under Medicare Part D? ▼
In 2024, Mark Okawachi, PA-C wrote 564 Medicare Part D claims totaling $7K in drug costs for 205 beneficiaries.
Where is Mark Okawachi, PA-C located? ▼
Mark Okawachi, PA-C is located at 1425 S MAIN ST, Walnut Creek, CA, 94596. Phone: (925) 295-4130.
What is Mark Okawachi, PA-C's NPI number? ▼
Mark Okawachi, PA-C's National Provider Identifier (NPI) is 1114078631, issued on 01/12/2007.
Does Mark Okawachi, PA-C prescribe more brand-name or generic drugs? ▼
Mark Okawachi, PA-C's prescribing is 4% brand-name and 96% generic drugs by claim count, with $2K in brand drug costs.
Does Mark Okawachi, PA-C prescribe opioids? ▼
Yes, Mark Okawachi, PA-C had 221 opioid claims in 2024 with an opioid prescribing rate of 39.2%.
How many Surgical Physician Assistant providers are there in the US? ▼
There are 16,380 Surgical Physician Assistant providers across 54 states in the US. The average Surgical Physician Assistant provider writes 341 Medicare Part D claims per year.
What drugs does Mark Okawachi, PA-C prescribe most often? ▼
Based on 2024 Medicare Part D data, Mark Okawachi, PA-C's most frequently prescribed drugs include Oxycodone Hcl, Ondansetron Odt, Omeprazole. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Mark Okawachi, PA-C accept Medicare? ▼
Mark Okawachi, PA-C appears in CMS Medicare data with 564 Part D claims and 205 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Mark Okawachi, PA-C's credentials? ▼
Mark Okawachi, PA-C's NPI is 1114078631 with credentials PA-C. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2024). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of August 2026 (NPPES) / 2024 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of August 2026.